Hi, I'm looking at a new S90D, but it's a major purchase for me so I'm looking to save where I can. But, I'm willing to spend if it's a good investment in terms of enjoyment and longevity of the car. So far I'm thinking AP and full self-driving, which are big appeals of the car. Are any of the other options considered must-have? On that note, are there are any options that are a clear waste of money? For example, I'm buying in CA so the sub-zero package isn't useful at all.